ETF comparison
AGG vs SPAB
Both US Aggregate Bond.
iShares Core U.S. Aggregate Bond ETF · State Street SPDR Portfolio Aggregate Bond Index ETF
Holdings overlap
6,854 positions appear in both funds. Buying equal dollars of AGG and SPAB would leave roughly 57.4% of each dollar exposed to the same underlying securities.
Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for why.
Cost difference
Expense ratios are effectively identical (0.030% vs 0.030%).
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with AGG vs SPAB.
Top shared holdings
6,854 shared in total| # | Holding | In AGG | In SPAB | Overlap |
|---|---|---|---|---|
| 1 | United States Treasury | 0.40% | 0.40% | 0.40% |
| 2 | United States Treasury | 0.38% | 0.40% | 0.38% |
| 3 | United States Treasury | 0.40% | 0.37% | 0.37% |
| 4 | United States Treasury | 0.38% | 0.37% | 0.37% |
| 5 | United States Treasury | 0.41% | 0.37% | 0.37% |
| 6 | United States Treasury | 0.39% | 0.37% | 0.37% |
| 7 | United States Treasury | 0.39% | 0.36% | 0.36% |
| 8 | United States Treasury | 0.37% | 0.34% | 0.34% |
| 9 | United States Treasury | 0.39% | 0.34% | 0.34% |
| 10 | United States Treasury | 0.37% | 0.33% | 0.33% |
| 11 | United States Treasury | 0.34% | 0.32% | 0.32% |
| 12 | United States Treasury | 0.31% | 0.34% | 0.31% |
Only in AGG
6,528 total- United States Treasury 0.32%
- United States Treasury 0.31%
- United States Treasury 0.26%
- Government National Mortgage Association 0.20%
- United States Treasury 0.18%
- UMBS, TBA 0.17%
- United States Treasury 0.16%
- Government National Mortgage Association 0.16%
- UMBS, TBA 0.15%
- UMBS, TBA 0.15%
Only in SPAB
1,431 total- Government National Mortgage Association 0.28%
- UMBS, TBA 0.27%
- United States Treasury 0.23%
- UMBS, TBA 0.23%
- Government National Mortgage Association 0.21%
- Freddie Mac 0.20%
- Freddie Mac 0.20%
- Freddie Mac 0.20%
- United States Treasury 0.18%
- Government National Mortgage Association 0.17%
Related comparisons
More comparisons with AGG
- AGG vs GVI · iShares Intermediate Government/Credit Bond ETF 54.4%
- AGG vs BSV · Vanguard Short-Term Bond Index Fund ETF Shares 33.9%
- AGG vs GOVT · iShares U.S. Treasury Bond ETF 32.0%
- AGG vs USIG · iShares Broad USD Investment Grade Corporate Bond ETF 24.1%
- AGG vs AGGY · WisdomTree Yield Enhanced U.S. Aggregate Bond Fund 23.1%
- AGG vs SPTI · State Street SPDR Portfolio Intermediate Term Treasury Index ETF 21.0%
More comparisons with SPAB
- SPAB vs IUSB · iShares Core Universal USD Bond ETF 51.5%
- SPAB vs GVI · iShares Intermediate Government/Credit Bond ETF 49.7%
- SPAB vs EAGG · iShares ESG U.S. Aggregate Bond ETF 46.3%
- SPAB vs BSV · Vanguard Short-Term Bond Index Fund ETF Shares 34.9%
- SPAB vs GOVT · iShares U.S. Treasury Bond ETF 29.7%
- SPAB vs AGGY · WisdomTree Yield Enhanced U.S. Aggregate Bond Fund 19.1%
Percentages are holdings overlap with the named fund.
Open AGG or SPAB at a brokerage
Both funds trade commission-free at major US brokerages.
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.
Holdings overlap is the sum of min(weight_a, weight_b) over positions
matched on ISIN (CUSIP fallback). Methodology: see
/methodology/.
Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.